<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>id选择器</title>
    <style type="text/css">
        #gz{
            color: blueviolet;
        }
        #css1{
            color: blue;
        }
    </style>
</head>
<body>
<h1 id="gz">标签</h1>
<br>
<div id="css1">dsdsds</div>
</body>
</html>